+static void gis_callback_class_init(GisCallbackClass *klass)
+{
+}
+
+/**
+ * gis_callback_new:
+ * @callback: the function to call to draw the object
+ * @user_data: user data to pass to the drawing function
+ *
+ * Create a #GisCallback object with an associated function and user data.
+ *
+ * Returns: the new #GisCallback
+ */